降凝剂对高蜡稠油的改性效果及机理研究  

Flowability Improvement by Pour Point Depressant WHP for Zhengwangzhuang High Waxy Crude Oil

作　　者：李美蓉[1] 王海波[2] 娄来勇[1] 庄岩[1] 

机构地区：[1]中国石油大学化学化工学院,山东东营257061 [2]中国石化胜利油田公司采油工艺研究院,山东东营257000

出　　处：《油田化学》2007年第1期83-86,共4页Oilfield Chemistry

摘　　要：实验研究了工业品原油降凝剂WHP改善含蜡56.9%、其中96.6%为正构烷烃的胜利郑王庄稠油流动性的效果。WHP含乙烯/醋酸乙烯/乙烯醇嵌段聚醚三元共聚物30%-35%。在60℃将WHP加入稠油中,测定其凝点和32℃、0-42.6 s^-1范围5个剪切速率下的黏度,均随WHP加量的增加（50-300 mg/L）而降低,200 mg/L为最佳加量,在该加量下0.32 s^-1黏度由34.16 Pa·s降至79.2 mPa·s,凝点（℃）、屈服值（Pa）、稠度系数（Pa·s^n）分别由49.0、32.42、31.57降至39.5、0.1297、0.02142,流型指数由0.1176升至0.9790。由黏温曲线求出,加入200mg/L WHP使该稠油析蜡点由65℃降至58℃,反常点由70℃降至50℃。根据空白和加剂原油扫描电镜照片显示的蜡晶形态,利用共晶机理分析讨论了WHP这种高分子表面活性剂的降凝、降黏、改善流动性的作用。图3表3参5。The flowability improvement by using commercial pour point depressant WHP is studied for Zhengwangzhuang viscous crude oil of Shengli, containing 56.9 % wax, of which 96.6 % is noraml paraffins. WHP comprises 30-35 % terpolymer ethylene/vinylacetate/vinyl alcohol copolyether and is introduced into the crude oil at 60℃. The pour point and the viscosity at 32℃ and shear rate 0-42.6 s^-1 are determined for the WHP treated crude oil and shown to decrease with increasing WHP dosage from 50 to 300 mg/ L with the optimal dosage being of 200 mg/L. At this dosage the viscosity at 0.32 s^-1 decreases from 34.16 Pa·s to 79.2 mPa·s, the pour point-from 49.0℃ to 39.5℃, the yield stress-from 32.42 to 0. 1297 Pa, the consistancy coefficient K-frorn 31.57 to 0.02142 Pa·s^n and the flow patern index n increases from 0. 1176 to 0. 9790. It is ascertained on the basis of viscosity-temperature curves that introducing WHP at dosage 200 rng/L leads to lowering down the wax precipitation point of the crude oil from 65℃; to 58℃ and its anomaly point from 70℃ to 50℃. The crystalline morphologies of wax precipitated from the crude oil, blank and WHP treated, are observed under SEM and the pour point depressing, viscosity reducing and flowability improving functions of WHP as a polymeric surfactant are discussed with a cocrystallization concept taken into consideration.

关 键 词：含蜡原油 稠油 降凝剂 高分子表面活性剂 流动性改进剂 流变性能 凝点 蜡晶形态 胜利郑王庄油田 

分 类 号：TE869[石油与天然气工程—油气储运工程] TE39